Re: Free Up Stuck Engine With DRY ICE??

Posted by Al English on February 12, 2001 at 05:29:46 from (24.30.29.47):

In Reply to: Free Up Stuck Engine With DRY ICE?? posted by Obie on February 11, 2001 at 18:13:41:

Hi Obie, I read your post yesterday. This is the the first time I've never heard of using dry ice to free up an engine, so I took some time to think about it before answering. My first thought was the same as JoeK's cooling the pistons crown that much more than the skirt might cause even a forged aluminum piston to crack. The other concern is the piston pin. Wrist pins are fitted with very little clearance. Cooling the piston to that extent will result in an interference fit between the piston & pin on even a well worn engine. If the engine is one in which the piston pins are retained by a press fit in the connecting rod, the pin must be free to rotate in the piston. This aluminum to steel bearing surface is very touchy about having enough crearance and lube. If you've ever had a new pin get stuck in a piston when all you were doing is sliding it in, you know what I mean. Rotating an engine that has pressed in piston pins, with an interference fit between the pin and piston, is a bad deal. And, with the pin tight, the rod is trying to turn the piston sideways in the bore when the engine is rotated. If the engine has full floating piston pins, and you decide to give the dry ice a try, I like Z-bar's idea of putting the dry ice inside the piston as this would cool entire piston instead of just the crown.

I have a friend who buys all kinds of neglected tractors, trucks, machinery, etc. The local farmers like to come by and watch him working his farm with his antique "junk". Using oil and patience I've seen him free up many engines I would have written off. Sometimes it takes a coulpe weeks of soaking and jiggling, but I don't think he's ever had one he couldn't free up...Al English

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